The glow duration of glow in the dark pigment continues to increase with each iteration. The first generation of glow in the dark pigment containing radium element can only emit light for more than ten minutes, but it has been eliminated due to its generate radiation. The second generation glow in the dark pigment mainly composed of Zinc Sulphate(ZnSO4), can emit light for about 1-2 hours, but the supply is decreasing because its production process caused environmental pollution. Nowadays, the majority of the products on the market are third generation glow in the dark pigment made by Strontium Aluminate and rare earth, which can emit light for 8 to 12 hours. It is non-toxic, harmless, non-radiative, and eco-friendly, and is currently widely used.
As for the duration of the glow, this is a subjective concept that depends on people’s perception of luminosity. Different individuals have their own opinions on the length of time for the glow. To objectively compare the glow duration of different brands, certain conditions must be met.
First, the particle size of the glow in the dark pigment must be consistent. The larger the particle size, the more light it absorbs, and the longer afterglow. Second, the powder needs to be adequately charged（by exposure to sunlight for 10-15 minutes or UV light for 5 minutes）. Finally, the testing needs to be conducted in a completely dark indoor environment with no windows, lights, or other sources of light. Under these conditions, the glow duration of glow in the dark pigment can reach 8-12 hours.
What are the factors that affect the glow duration of glow in the dark pigment?
The strength and distance of the light source, exposure time, ambient brightness, and the luminosity level of the powder all play a role in determining the luminosity of the powder.
Specifically, the weaker the light source, the worse the glow effect of the glow in the dark pigment. In contrast, the stronger the light source, the better the glow effect.
The closer the light source, the better the glow effect. Conversely, if the light source is far away, it can affect the light absorption of the Glow in the dark pigment, resulting in a shorter glow duration.
If the exposure time is too short, such as only 10 seconds of light exposure, the Glow in the dark pigment will not absorb enough light, resulting in a shorter glow duration.
In areas with bright street lights, glow in the dark pigment is not suitable because the glow is weaker and not visible to the naked eye. On the contrary, in areas without street lights, the glow effect will be better.
Different levels of luminosity of glow in the dark pigment also affect the glow duration. The higher the luminosity level, the better the glow effect, and the longer afterglow.
In summary, the duration of the glow is related to factors such as actual scenes and usage conditions in practical applications. It is recommended to take a sample and observe it yourself to determine if you are satisfied with the afterglow time.
